Question

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Answer 1

Start with a diagram

Answer 2

locate (-5,-7) on a cartesian plane.

Answer 3

r=sqrt(25+144)=13
now tan(theta) = 5/7
but the points lie in the fourth quad
hence is it (13,arctan(5/7) -pi)

Answer 4

Use this point and the horixzontal axis and the origin to creata right triangle

Answer 5

thanks!

Answer 6

then follow matricked's working out but, check the angle !